We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
Most of the demographic changes he blames on the decline of religion have other known causes. For example, both the decline of marriage and the increase in out-of-wedlock births are results of the welfare/child-support bureaucracy, which gives women all the benefits of marriage without any need for them to marry (often at the expense of some guy who got tricked into fathering a child he didn't want to create).
He also glossed over the legal reasons for the adoption of the "separation of church and state." Yes, when the Constitution was ratified, three states had established churches and kept them; the "no establishing a church" rule only applied to the feds, then. But like pretty much everything else in the Bill of Rights, that rule was extended to the states by the 14th Amendment (or at least the Court has so ruled).
I share some of the speaker's nostalgia for the past -- but to give God credit for Man's achievements, or even one's own, without any evidence sure sounds a lot to me like saying, "I owe my success in life to the fact that I still suck my thumb."
WRT welfare/child-support bureaucracy, I would suggest that if the people on welfare took their religion seriously enough, they would still not have out of wedlock births.
While lack of religion is not a predictor of immoral behavior IMHO, any religious belief (not as a facad) does not guarantee encourages moral behavior.
There is obviously a strong religious reason to give God credit for our successes but there is a moral one, also. Giving God credit for successes is a way to keep humble. Humble people are far less likely impose their will on others.
Moral people who are not religious rarely, if ever, credit religion for their own moral code, but moral codes have their basis in religious codes. I think if you strip away the mysticism, stories, and laws, religions that are ethical and monotheistic basically tells us how to live at peace with one and other (excluding zealots).
I don't discount the positive role religion plays in a society.